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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
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package org.apache.doris.nereids.trees.expressions;

import org.apache.doris.nereids.exceptions.UnboundException;
import org.apache.doris.nereids.trees.AbstractTreeNode;
import org.apache.doris.nereids.trees.NodeType;
import org.apache.doris.nereids.types.DataType;

import java.util.List;

/**
 * Abstract class for all Expression in Nereids.
 */
public abstract class AbstractExpression<EXPR_TYPE extends AbstractExpression<EXPR_TYPE>>
        extends AbstractTreeNode<EXPR_TYPE>
        implements Expression<EXPR_TYPE> {

    public AbstractExpression(NodeType type, Expression... children) {
        super(type, children);
    }

    public DataType getDataType() throws UnboundException {
        throw new UnboundException("dataType");
    }

    public String sql() throws UnboundException {
        throw new UnboundException("sql");
    }

    public boolean nullable() throws UnboundException {
        throw new UnboundException("nullable");
    }

    @Override
    public List<Expression> children() {
        return (List) children;
    }

    @Override
    public Expression child(int index) {
        return (Expression) children.get(index);
    }
}
